1) Compute the critical value z/2 that corresponds to a 94% level of confidence.

z/2 = __?__ (Round to two decimal places as needed.)

2) Construct a 90% confidence interval of the population proportion using the given information.

x=175,n=250

The lower bound is __?__

The upper bound is __?__

(Round to three decimal places as needed.)

3) A survey was conducted that asked 1017 people how many books they had read in the past year. Results indicated that x=10.9 books and s=16.6 books. Construct a 99% confidence interval for the mean number of books people read. Interpret the interval.

Construct a 99% confidence interval for the mean number of books people read and interpret the result. Select the correct choice below and fill in the answer boxes to complete your choice. (Use ascending order. Round to two decimal places as needed.)

A.

There is a 99% probability that the true mean number of books read is between

__?__ and__?__.

B.

There is 99% confidence that the population mean number of books read is between

__?__ and __?__.

C.

If repeated samples are taken, 99% of them will have a sample mean between

__?__ and __?__.